I work on some free software projects and most people don't even know who RMS is. There are multiple Free/Open Source software associations, projects and communities to choose, all with different people working on them, some of them don't tolerate such behavior.
If none of those fit, people can just create their own and choose who to associate with.
This is clearly a fabricated justification. But if such people were to actually exist they would not participate in the free software movement either way due to misalignment of values and ideologies.
Bushnell makes the excellent point that he wasn't pushed out for this email alone, but for the pattern of thought the email indicates when aligned with other behaviors in his career.
https://medium.com/@thomas.bushnell/a-reflection-on-the-depa...